From the reviews of the second edition:
“The book is an exhaustive survey on computer network security. It presents theoretical, practical problems and applications related to cyberspace security in general and computer network security in particular. ... this is a very well designed and implemented book that could be used by beginners and professionals in the field of computer network security.” (Todor Todorov, zbMATH, Vol. 1278, 2014)
“Kizza (Univ. of Tennessee at Chattanooga) includes a thorough primer on networking fundamentals and security concepts that will be helpful for readers with a range of expertise. ... This is an accessible and illustrative read on the topic ... . It will be useful for students and anyone curious about societal and personal concerns over the safety of networks in homes, offices, big business, and government. Summing Up: Highly recommended. Lower- and upper-division undergraduates, two-year technical program students, and general readers.” (T. D. Richardson, Choice, Vol. 51 (4), December, 2013)